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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Also, do you happen to know if there was a prior kernel version that did
not exhibit this bug?

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https://bugs.launchpad.net/bugs/1377279

Title:
  dmesg fills with "speaker allocation warnings"

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This is an issue with the driver message log filling with warnings,
  and NOT an actual issue with the hardware or software functionality.
  Sound on this system works as expected, but dmesg becomes cluttered
  with log information that does not appear of significant value,
  considering the frequency and repetition of the warnings.

  The following message appears, repeated on multiple consecutive lines:
  "sound hdaudioC0D0: HDMI ATI/AMD: no speaker allocation for ELD" and
  on some occasions is accompanied by an entry stating:
  "[drm:dce4_afmt_write_speaker_allocation] *ERROR* Couldn't read
  Speaker Allocation Data Block: 0"

  The system in question is a laptop with an external monitor connected
  over HDMI. It has been freshly built with Lubuntu 14.10 Beta 2, and
  the same issue also occurs when using testing the mainline kernel
  3.17.0-031700rc7.201409281835.

  The occasions on which this issue (the repeated warnings) occurs under strict testing conditions include:
  * Using the Monitor Preferences (LXRandR) to turn OFF and ON the external monitor (approx 10 warnings for each action)
  * Putting the system into the suspend power mode and subsequently resuming (approx 30 warnings)

  No warnings occur when:
  * unplugging or plugging the HDMI cable
  * locking and unlocking the lightdm desktop

  I have observed occasions where the warnings are written many, many
  hundreds of times, on an almost continuous basis, but I have not been
  able to reproduce this behavior in controlled circumstances.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-20-generic 3.16.0-20.27
  ProcVersionSignature: Ubuntu 3.16.0-20.27-generic 3.16.3
  Uname: Linux 3.16.0-20-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  art        2113 F.... pulseaudio
   /dev/snd/controlC0:  art        2113 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDesktop: LXDE
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  Date: Fri Oct  3 19:20:02 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-26 (7 days ago)
  InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  MachineType: Acer AO722
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-20-generic root=UUID=bf9f8de0-2b70-4f49-85ee-54f7d94a6508 ro
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 09/25/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.11
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JE10-BZ
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.11
  dmi.modalias: dmi:bvnAcer:bvrV1.11:bd09/25/2012:svnAcer:pnAO722:pvrV1.11:rvnAcer:rnJE10-BZ:rvrBaseBoardVersion:cvnAcer:ct10:cvrV1.11:
  dmi.product.name: AO722
  dmi.product.version: V1.11
  dmi.sys.vendor: Acer

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